Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd40686b4fde2dd…

MALICIOUS

PDF

70.6 KB Created: 2021-09-23 18:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: facc9c98248950a9032a17b458a5edfe SHA-1: 885a4ae78df9f809ae8cb61e6a1acda0e710a384 SHA-256: 1bd40686b4fde2dda96c37d60d70c60772ad35d04fef772adfaa5b91645838ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=picsart+gold+version+apk PDF link annotation
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/pebesidomogigapod.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131c6a808179---78608305412.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/xusosaresere.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/xigezidepuwexo.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/5509793020.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/vumisomasuvenizapab.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/92280204521.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/16261229744.pdfIn PDF document text
    • https://preciseenergygroup.com/media/seset.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/22078126185.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210917_31CDD9E367CA51A0.pdfIn PDF document text
    • http://canadanur.com/resimler/files/39618065743.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/fotiwutafupekororuj.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/ximodujij.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614515bc17681---48358794306.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/18047757489.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/tulomexexekogowikev.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/labezikuritomigisareno.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/takamadiletemate.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/dipajabolumetilex.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/tizaditi.pdfIn PDF document text
    • http://glassick.com/userfiles/file/mapumup.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51B 15356 bytes
SHA-256: 1f8134b478ace29e9f6da40d0b28a2283d7904ad1e78da1f7dbe4f7485662d4c
font_01_sfnt_off0000dbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 10848 bytes
SHA-256: b6e63c6215b7ae8ebf4a065561312a34dfbf6e8880593c19bfba497ac177ed17

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